a. Anat. [f. L. tectōrium covering, a cover (f. tectōrius: see next) + -AL.] Covering like a roof: applied to a membrane in the internal ear (see quot.).
1890. Billings, Nat. Med. Dict., Tectorial membrane, a gelatinous structure covering [the] organ of Corti, stretching fro upper part of the limbus spiralis over the outer hair-cells.
